Transform the below sentences into affirmative (+), negative (-)and interrogative (?) form. 1. (+) They are working on the new show right now. (-)_______________________________________________________________. (?)_______________________________________________________________. 2. (+)_____________________________________________________________. (-) She is not talking on the phone at the...
Đọc tiếp
Transform the below sentences into affirmative (+), negative (-)
and interrogative (?) form.
1. (+) They are working on the new show right now.
(-)_______________________________________________________________.
(?)_______________________________________________________________.
2.
(+)_____________________________________________________________.
(-) She is not talking on the phone at the moment.
(?)_______________________________________________________________.
3.
(+)_____________________________________________________________.
(-)_______________________________________________________________.
(?) Is he running very fast?
4.
(+) Julia is baking a chocolate cake at the moment.
(-)________________________________________________________________.
(?)________________________________________________________________.
5.
(+)______________________________________________________________.
(-)________________________________________________________________.
(?) Are Tony and Kaity helping the teacher right now?
giúp e với hứa kick
giúp e vs
Xét tg vuông OAC và tg vuông OMC có
OC chung
OA=OM=R
\(\Rightarrow\Delta OAC=\Delta OMC\) (Hai tg vuông có cạnh huyền và cạnh góc vuông bằng nhau) \(\Rightarrow\widehat{OCA}=\widehat{OCM}\) (1)
Ta có
CA=CM => tg CMA cân tại C (2)
Từ (1) và (2) \(\Rightarrow AM\perp OC\) (trong tg cân đường phân gics của góc ở đỉnh đồng thời là đường cao)
Xét tg vuông OAC có
\(OA^2=R^2=OH.OC\) (trong tg vuông bình phương cạnh góc vuông bằng tích giữa hình chiếu cạnh góc vuông đó trên cạnh huyền với cạnh huyền)